Coring device



Patented sept. ii, Teas. f

REID'B. GRAINGER, OF REDONDO BEACH,

CALIFORNIA, ASSIGNOR T ELLIOTT CORE DRILLING COMANY, A CORPORATION OF CALIFORNIA.

conrNG Dnvronf Application filed .Tun-e 1,

My invention relates to coring devices of the double ba'rreltype wherein flushing Huid is used during the drilling operation.

In using coring devices of the type referred to, circulating fluid under pressure is discharged to the cutting level through the drill. Consequently, the hole is partially filled with this fluid, the heavier portion of which settles to the bottom of the hole belo tween coring operations. As the drill is lowered into the hole, the fluid enters the inner or core barrel proper which. becomes lilled with the fluid. r1`o'permit exit of this I fluid from the core barrel, such barrels are usually provided with a valve mounted on the upper end of the core barrel'an'd so arranged that, as the core enters the core barrel, the fluid above the core is discharged through the valve ordinarily against the pressure of the flushing fluid.

The principal to provide an attachment for the upper end of the core barrel, of simple form and construction which is so constructed as to cause the circulating fluid to produce. an aspirating elect on the fluid being discharged from the core barrel, thereby relieving the presi sure in the core barrel and rresulting in an unobstructed entrance of thecore into the barrel.

Other objects and advantages will readily appear to those skilled in the art from the following description and the accompanying drawings.

Referring to the drawings'which are for illustrative purposes only- Fig. 1 is a vertical sectional yview of a core drill` embodying a form of my .invention.

of Fig. 1.

Fig. 3 is a sectional plan view on line 3-8 of Fig. 1.

Fig. 4 is a side elevation of the upper end of the core barrel. i

The drill shown is of the rotary type and consists generally of an outer barrel 11, the upper end of which is connected to the lower end of the tubing 12 through which the drill is rotated. The lower end of the outer barrel 11 is threaded into the drill body 13, which is provided with cutting blades 14 and 15, and which terminates in an annular cutter 16, surrounding a central. opening 17 which receives the core, i

object of my invention is" Fig. 2 is a sectional plan view on line 2-2 I vbodying my invent-ion, this material is dis- 1927. Serial No. 195,638.

Threaded with the body 13 is an inner or core barr'el 18, which is spaced apart from the outer barrel 11, thereby forming an annular passage 20, through which the flushing fluid is circulated'downward and out .through discharge openings 21 formed in the drillbody 13. Threaded into the upper end of the core barrel 18 is a hollow head 22, provided with a perforated plate 23v for preventing the core or large cuttings clogging the valve 24.

The valve 24V operates in a cage 25 which is threaded into the upper part of the head 22, extending upwardly therefrom to support a hood 27 threaded unto the upper end of the cage 25.

The upper end of the head 22 is tapered inwardly and upwardly under -thel-,skirt 28 of the hood 27 which skirt, at its innen lower edge, .is correspondingly tapered and spaced apart froii' the tapered'portion of the head, thereby forming a downwardly discharging annular passage 30 therebetween, for the purpose hereinafter described.

It is also to.be noted that the exterior of the head 22 isi tapered downwardly and out.

wardly giving theeffect of a-nozzle to the circulating 'fluid passing downwardly .past the discharge opening 30..

It is 'to be understood that the drill'is operated in the usual manner, in so far as the drill proper-is concerned, and that dur-v ing the drilling operation the core enters the core barrel forcing any accumulation above the core in the barrel through the valve 24 and out through the' cage 25, which, with a drill as ordinarily constructed, such material passing through the valve is against the pressure of the circulating Huid.

In using a device as above described, em-

charged from the cage'25 under the hood 2 7, and is discharged downwardly through the fannular passagige 30. Due to the aspira-ting effect of the circulating fluid under considerable pressurepassing downwardly entirely around the discharge passage 30, the pressure in the cage is relievedthereby permitting the valve 24 more readily to unseat, resulting inv a relieving of the pressure in the core barrel and a consequent diminishing of the resistance in the core barrel to the core, and the obtaining of a core more proportionate in length to the 'depth of Strata actually drilled through,

What I claim as lmy invention is:

1..In combination, a core drill having an inner and outer barrel forming a passage therebetween for circulatingfluid, a valve at the upper end of the inner barrel, and means for forming an annular discharge outlet for said`valve, discharging into the circulating iiuid' passage. s

2. In combination,` a core drill having an inner and outer barrel forming an annular Y :passage therebetween for circulating fluid,

a head on the upper end of said inner barrel, a valve in said head, and means cooperating with said head independent of said barrel forming therewith an annular discharge o utlet for said valve into'saidffluid passage. 3. In combination, a core drill having'an inner and outer barrel'forming' an annular passage therebetweenI for circulating vfluid, a head on the upper'end of said innei` barrel a valve in said head, and meanscooperating with said head independent of said barrel forming therewith an annular downwardly and outwardly diverging discharge outlet for said Valve into said fluid passage.

4. In combination, a core drill having an inner and outer barrel forming an annular passage therebetween for circulating fluid,

a head on the upper end of said inner barrel, a hood over said valve having its lower" end spaced apart from said head to form an annular discharge opening for said valve into said fluid passag'e.

5. In combination, a core drill having an inner and outerA barrel forming an. annular passage therebetween for-circulating Huid, a head on the upper end of said-inner barrel,

a hood over said valve havingv its lower end spaced apart from said head to form an annular downwardly and outwardly diverging discharge opening for said valve into said Huid passage.

' resa-ose 6. In combination, a core drill having anA "said head to form an annular discharge' opening therebetween.

7. In combinatioma core drill having an outer and inner barrel spaced apart to form f a circulating fluid passage therebetween; a head on the upper end of said barrel terminating at its upper end in lan inwardly and upwardly tapered portion, avalve, a.

cage for said valve'mounted on said head and a hood mounted on said cage having its lower inner tapered correspondingly to the tapered-portion of 'said-head and spaced apart therefrom, to form an annular discharge opening for said valve.

8.In combination, a core drill having an Outer and inner barrel spaced apart to form' a` circulating 'fluid passage therebetween, a

head on the upper end of said barrel terminating at its upper end in an inwardly and upwardly tapered portion, ajvalve, a.

cage for said valve mounted on said head and a lioodmounted on said cagehaving its lower inner edge tapered correspondingly to the tapered portion of said head and spaced apart therefrom, to form an annular ldischarge opening forsaid valve, said hood having its outer face tapered outwardly and downwardly toward its lower end to form, with the outer barrel, an annular nozzle about the discharge opening from saidlvalve. i

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 27 day of May, 1927.

REID B. GRAINGER. 

